This is a blender-made horseradish chive aioli — essentially a quick homemade mayo with a sharp, herby kick. It comes together in about 10 minutes and works on beef, chicken, fish, lamb, or veggie patties without any one flavor bullying the others. If you’ve been reaching for store-bought sauce out of habit, this is the recipe that changes that.
The short version of why this works
Two things make this aioli succeed or fail. First, the emulsification: blending the egg yolk, mustard, and lemon juice together before any oil goes in gives you a stable base. The mustard isn’t just flavor — it’s an emulsifier that helps the oil and yolk bond. Second, the oil has to go in slowly. A thin, steady drizzle while the blender runs gives the yolk time to grab each drop of oil and hold it. Rush that step and the mixture breaks into a greasy puddle. Once you’ve nailed the emulsion, the horseradish and chives just fold in at the end — no more blending needed, which keeps the chives from turning the whole thing green.
Smart swaps
- Canola vs. olive oil: Extra-virgin olive oil can turn bitter when blended at high speed for too long. Canola or a light (not extra-virgin) olive oil gives a cleaner, more neutral result. If you want olive oil flavor, use half and half.
- Prepared horseradish: This is the jarred, vinegar-packed kind — not horseradish sauce, which is cream-based and much milder. Check the label before you buy.
- Pastured egg yolk: Any large egg yolk works fine here. Pastured eggs have a richer color but won’t change the flavor noticeably in a sauce this bold.
- Lemon juice: White wine vinegar is a solid substitute if you’re out of lemons — use the same amount.
Storage and reheating
Transfer the aioli to a sealed jar or airtight container and refrigerate it immediately after making. It keeps well for up to one week. Don’t freeze it — the emulsion breaks on thawing and you’ll end up with a separated, oily mess that can’t be rescued. There’s no reheating involved; serve it cold or at room temperature straight from the fridge. If it thickens up more than you’d like after chilling, stir in a few drops of cold water and mix briefly to loosen it.
If something goes sideways
- The mixture looks thin and oily, not creamy: Your emulsion broke. Pour the broken mixture into a cup, add a fresh egg yolk to the (clean) blender, and very slowly drizzle the broken mixture back in — same technique as the original recipe. It almost always comes back together.
- It tastes flat: Horseradish loses its punch quickly once a jar is opened. Use a fresh jar or add a little more than the recipe calls for, tasting as you go. A small extra squeeze of lemon juice also sharpens the flavor fast.
- The aioli is too thick to spread: Stir in cold water, half a teaspoon at a time, until it reaches a spreadable consistency. Don’t add more oil — that just makes it richer, not looser.
- It tastes strongly of raw egg: Skip the extra egg yolk trick and make sure your lemon juice measurement is accurate — the acid helps mellow that raw note. Using a very fresh egg also matters more here than in cooked recipes.
- The chives turned the sauce an odd green color: They were probably blended in rather than folded. Chop them fine and stir them in by hand after the aioli is out of the blender — that’s the fix going forward.
Horseradish Chive Aioli
Equipment
- Blender (standard or immersion)
- Small measuring cups and spoons
- Airtight glass jar or container for storage
- Rubber spatula
Ingredients
- 1 large egg yolk pastured, at room temperature
- 1 tablespoon Dijon mustard 15g
- 1 tablespoon fresh lemon juice 15ml, about half a small lemon
- 1 cup canola oil 240ml — light olive oil or avocado oil also work; avoid extra-virgin olive oil, blending turns it bitter
- ½ teaspoon prepared horseradish 3g, or more to taste
- 1 tablespoon chives finely chopped, about 4–5 stalks
- 1 tablespoon fresh flat-leaf parsley finely chopped, for garnish
- ¼ teaspoon fine sea salt or to taste
- ⅛ teaspoon freshly ground black pepper or to taste
Instructions
- Add the egg yolk, Dijon mustard, and lemon juice to a blender. Blend on medium speed for about 10 seconds until smooth and pale yellow.1 large egg yolk, 1 tablespoon Dijon mustard, 1 tablespoon fresh lemon juice
- With the motor still running, add the oil a few drops at a time for the first 30 seconds. Once the mixture begins to thicken visibly, increase to a very slow, thin stream. Continue until all the oil is incorporated.1 cup canola oil
- Once all the oil is added, blend for another 5 seconds until the aioli is thick, creamy, and fully emulsified. Transfer the aioli to a bowl using a rubber spatula. Gently fold in the prepared horseradish and chopped chives by hand — do not blend them in, or the chives will turn the aioli green. Set the parsley aside for garnishing when serving.½ teaspoon prepared horseradish, 1 tablespoon chives, 1 tablespoon fresh flat-leaf parsley
- Taste and season with salt and pepper, adjusting horseradish if you want more heat. Transfer to an airtight jar or container and refrigerate for at least 30 minutes before serving to let the flavours meld. The aioli will thicken as it chills; stir in a few drops of cold water if you prefer a thinner consistency.¼ teaspoon fine sea salt, ⅛ teaspoon freshly ground black pepper
Notes
Nutrition
Frequently asked questions
Can I make this aioli ahead of time?
Yes — it actually improves after an hour or two in the fridge as the horseradish and chive flavors settle into the base. Make it the night before or earlier in the day and keep it sealed in the refrigerator until you’re ready to build your burgers.
Is it safe to eat raw egg yolk in homemade aioli?
For most healthy adults, the risk from a single pasteurized or very fresh egg yolk is low, but it is a real consideration. If you’re cooking for young children, pregnant people, or anyone immunocompromised, use a pasteurized egg yolk, which is widely available in most grocery stores.
Can I use a regular whisk instead of a blender?
You can, and it works — it just takes more effort and patience. Whisk the yolk, mustard, and lemon juice together in a bowl, then add the oil drop by drop while whisking constantly. A damp towel under the bowl keeps it from spinning while you pour.
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